33 lines
963 B
JavaScript
33 lines
963 B
JavaScript
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var isArrayLike = require('./isArrayLike'),
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isIndex = require('./isIndex');
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/**
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* The base implementation of `_.at` without support for string collections
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* and individual key arguments.
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*
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* @private
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* @param {Array|Object} collection The collection to iterate over.
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* @param {number[]|string[]} props The property names or indexes of elements to pick.
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* @returns {Array} Returns the new array of picked elements.
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*/
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function baseAt(collection, props) {
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var index = -1,
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isNil = collection == null,
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isArr = !isNil && isArrayLike(collection),
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length = isArr ? collection.length : 0,
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propsLength = props.length,
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result = Array(propsLength);
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while(++index < propsLength) {
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var key = props[index];
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if (isArr) {
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result[index] = isIndex(key, length) ? collection[key] : undefined;
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} else {
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result[index] = isNil ? undefined : collection[key];
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}
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}
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return result;
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}
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module.exports = baseAt;
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